Group B Streptococcal Enhancement Culture, Vaginal/Rectal


Sunquest Code:BETAB  
Epic Code:LAB3316Epic Name:Beta Strep Group B R/O Culture
Methodology:Culture
CPT Code:87081, 87077
Turnaround Time:Results are reported within 3 days.
Associated Links:

IDDL (Microbiology/Virology) Collection Container Guidelines



Collection Instructions

Specimen:Swab/Dual Swab, specify source
Container:Culturette in liquid Stuart medium, CoPan Eswab with larger swab (CoPan Swab with smaller swab, See Collection Instructions)
Collection Instructions:UMMC, FRH, FSH, FNH, FLH: Use CoPan Eswab FRMC: Use culturette swab in liquid Stuart medium Vaginal introitus and anorectal specimens. Cervical cultures are not acceptable; a speculum should not be used for culture collection. Note: Because of its increased sensitivity, the Group B Streptococcus PCR assay is the preferred method. See separate Lab Guide entry: Group B, Streptococcus, PCR.


Processing and Shipping

Specimen Processing:Do not store.
Shipping Instructions:Ship at room temperature.
Test Performed at or Referral Lab Infectious Diseases Diagnostic Lab-Microbiology  (Fairview Range - FRMC, UMMC-East Bank, Grand Itasca GICH)


Interpretive

Reference Range:Negative for Group B Strep by culture
Use:

Detect group B streptococci in the genital tracts of expectant mothers. Identify infants at risk for infection and guide intrapartum administration of antibiotics. One approach has been adopted to reduce this disease: Guidelines advocate all pregnant women have a vaginal/rectal screening test for GBS between 35 and 37 weeks gestation. PCR-based assay is optimal for Group B streptococci.

 

Screening Based Strategy*

 

Perform vaginal/rectal screen at 35-37 weeks.

·          If positive, administer intrapartum antibiotics.

·          If results unknown (delivery <37 w), administer intrapartum antibiotics.

·          If results unknown (delivery ³37 w), refer to risk-based strategy.

·          If negative, do not administer intrapartum antibiotics.

 

*Consensus Guidelines for the Prevention of Perinatal Group B Streptococcal Disease (from the Centers for Disease Control and Prevention), Atlanta, GA.

 



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